Astrophysicist Neil deGrasse Tyson saw 'Interstellar' and then came by Business Insider to explain what the ending means – and if it's scientifically sound. In these concluding remarks from Part 1 of my Amsterdam flat Earth lecture, I address the issue of why I believe flat Earth is an important topic to be discussing. What may have started as a science fiction speculation—that perhaps the universe as we know it is a computer simulation—has become a serious line of . Use the URL: for 10% with a new website and support this channel. Also make your life easier. Thanks a lot to .